/* Copyright 2019 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import { Component } from 'react';
import PropTypes from 'prop-types';

const listeners = [];

class CameraEventListener extends Component {
  componentDidMount() {
    listeners.push(this.props.view.watch('camera', () => this.handleUpdate()));
    listeners.push(
      this.props.view.watch('stationary', () => this.handleUpdate()),
    );
  }

  componentWillUnmount() {
    listeners.forEach(listener => listener.remove());
  }

  handleUpdate() {
    if (!this.props.view.camera) return;

    this.props.onCameraChange({
      camera: {
        position: this.props.view.camera.position,
        heading: this.props.view.camera.heading,
        tilt: this.props.view.camera.tilt,
        scale: this.props.view.scale,
      },
      stationary: this.props.view.stationary,
      interacting: this.props.view.interacting,
    });
  }

  render() {
    return null;
  }
}

CameraEventListener.propTypes = {
  view: PropTypes.object,
  onCameraChange: PropTypes.func.isRequired,
};

CameraEventListener.defaultProps = {
  view: null,
};

export default CameraEventListener;
